# s = "hello1 world hello"
# print(s.count("hello"))
# s=s.replace(" ","")
# print(s.isalnum())
# print(s.isalpha())

s1=["hello","world","python"]
s2='?'.join(s1)
print(s2)

number=[1,2,3,4,5]
ss='-'.join(str(num) for num in number)
print(ss)